Brake rigging



Sept. 26, 1944.

M. P. BLOMBERG BRAKE RIGGING Filed-ApIil 28, 1943 Sn'vento aff? aGttornegs ulalented Sept. 26, 1944 BRAKE RIGGING Martin I. Blomberg,Hinsdale,A Ill., assigner tov General Motors Corporation, Detroit,Mich., a corporation of Delaware Application April 28, 1943, Serial No.484,807

6 Claims.

The problem which led to this invention was to provide for manualoperation of a substantially conventional power operated brake riggingas used on railwayvehicles.

The object is to provide for operating by hand, and preferably fromwithin a superposed locomotive body substantially conventional poweroperated brak-e rigging wherein only slight changes are made in saidbrake rigging.

Other objects and advantages will be understood from the descriptionwhich follows:

On the drawing, Fig. 1 is a view in longitudinal section showing inelevation a part of a vehicle.

with which the invention is used.

Fig. 2 is a View in vertical section as seen from line 2-2 of Fig. 1.

Fig. 3 is a plan view as seen from line 3-3 on Fig. 1.

Fig. 4 is a section, the section line and arrow lappearing on Fig. 3.

The body of a locomotive, a part 5 only of which is shown on Fig. 1, ismounted on a truck frame 1. The frame is supported as usual by wheelsone of which 9 and its axle Il are to be seen on the drawing.

The brakes for the wheels are substantially conventional. Associatedwith wheel 9, which may be illustrative of all, are shoe carrying brakeheads I3 and I5 adapted to frictionally engage the wheel tread. Brakehead I5 is hung from the truck frame by a hanger I1 pivoted to the frameat I9 and to the head at 2 I. Also pivotally supported at 2| is a livetruck lever 23. Its upper end is shackled at 25 (see Fig. 3) to the endof a horizontal lever 26 pvo-ted at an intermediate point 28' to theframe or otherwise supported for rocking about its pivot. The piston rod21 of an air brake cylinder 29 is connected to lever 26 as shown. On theother side of the wheel is a second truck lever 3l. At an intermediatepoint it is pivoted to brake head I3. The lower ends of levers 23 and 3lare connected vby two rods such as 33 straddling the wheel,

in the vehicle without interfering with the normal service air pressureapplication.

A bracket 3G is mounted in any convenient manner on the truck frame 1.By means of upper and lower flanges 31 it slidably supports a block 39carrying the pivot 4I supporting the upper end of lever 3l. The block 39is formed vwith a housing 43 within which is mounted on pivot axis 45 apulley 41. The housing keeps the cable 49 from dropping from the pulleyand is open for a part of its circumference for the passage of thecable. Above the housing there is secured an arm 5I for anchoring theend of a spring `53. The other end of spring 53 is anchored between thearms of a member 55 secured to the truck frame. This spring biases theblock to that end of its range of travel remote from the wheel. In theair pressure application of the brake the upper end of lever 3l issimilarly subjected to a pressure in the same direction with the resultthat the pivot 4I may be considered as ixed for the purpose of air brakeoperation as it normally is when the improvement of this invention isnot used. It is preferred to use spring 53 but it could be omitt-ed ifdesired.

Supported on the floor of the vehicle body is an upright stand 51rotatably supporting the winding shaft 5i) for the cable 49 and to whichone end of the cable is secured. The cable may extend through the stand,having its direction changed by a pulley 59. It then passes on to andaround the pulley 41. From the pulley 41 the cable extends to a fixedend anchorage 6I as shown. Numeral 63 refers to a hand wheel forwrapping the cable upon the winding shaft. Any known holding andreleasing means may be used with Wheel 63. Since the other end of thecable is xedly anchored, rotation of the wheel 63 will reciprocate theblock 39 and apply the shoes equally, the point 25 serving now as afixed anchorage. If one does not wish to take advantage of a movablepulley the cable end could be connected directly to the end of lever 3|.

It will be understood therefore that the operation of the air brake isin no way interfered with since, when the mechanical brake operationoriginating at wheel 63 is not used, the fulcrum of lever 3| may bethought of as fixed as it is in the conventional arrangement. In asimilar Way when the hand brake is used and the pivot point betweenlever 23 and lever 26 is not moved the action is in all-A respects likethat of conventional brake action.

I claim:

1. Brake means for a vehicle wheel comprising shoes adapted tofrictionally engage opposite sides of Said wheel, iirst and secondlevers 'pivoted to said shoes, a rod connecting one pair of ends of saidlevers, a power cylinder and piston rod, said piston rod being operablyconnected to the :second end of the rst lever, yielding means toposition the second end of said second lever in a position whereby itserves as an anchor for brake application by said power cylinder, andmanually operable means to move said second end of said second leveragainst the action of said spring, with the connection of the rst leverwith the saidoperable connection associated with the piston rod servingas an anchor.

2. In a vehicle, a truck frame, a wheel, brake shoes adapted tofrictionally engage opposite sides of said wheel, rst and second leverspivoted to said shoes., rods cennetine one pair .Qf ends of said levers,a brake .Operating newer syl.- inder and piston rod,V said piston rodbeing connected to the second end of the rst lever, a

bloes. slidable on said .frame and pivotelly supporting the second endof said `second liever, yielding means to hold said block at an end ofits movement whereby the second end ,of the second lever becomes Aananchorfor brake application by the power cylinder and other meansv formoving said block against the action of said spring to apply the brakeindependently of ,said

' 'power cylinder.

3. The invention ,defined by claim 2, said ,other means being a pulleycarried by said nblock, Aa cable passing over said pulley, aiixed anchorfor one end of said cable' and manually operable means to draw on theother en d of said cable.

4. The invention defined claim 2, ,said vehicle including a bodysuperposed over Said truck frame, said other means being a pulleyycarried by said block, a cable passing over said pulley,

an anchor on said truck frame for one end o! said cable, a winding shaftin said body, said cable having its other end wound on and secured tosaid shaft and hand operated means 5 to rotate said shaft.

5. In friction braking means` for vehicle wheels, the combinationcomprising two separate sources of braking effort, brake shoes eachadapted frictionally to engage a portion of an adjacent wheel, brakeshoe actuating levers, means Iconnecting each one of the brake shoes toone of said levers, means connecting one end Q f one of the levers toone end of the other lever, movable elements eachV adapted to be movedin one direction by one of said sources of braking effort, one of saidlevers being rotatably connected `to `each of saidV movable elements andmovable thereby to effect frictional engagement between each brake shoeand the adjacent go-wheel, means limiting movement of each of themovable elements when the other movable element is actuated by one ofthesources of braking eii'ort, and means normally biasing the movableelements to the positions in which the 25 movement of each is stoppedduring movement of Vthe other.

6. In a vehicle, a truck frame, a wheel, brake shoes adapted tofrictionally Yengage opposite sides of said wheel, rst and secondlever's `piv- 3() oted to saidshoes, rods connecting one pair of ends ofsaid levers, a brake operating power cylinder and piston rod, saidpiston rod being connected to the second end of the first lever, a

block slidable on said frame and pivotally sup- 35 porting the secondend of said second lever,

means to limit the movement of said block whereby the second end of thesecond lever becomes an anchor for brake application by the powercylinder and other means to move said P. BLOMBERG,

